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Stoich chem reactions practice Multiple Choice Identify the choice that best completes the statement or answers the question. ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ 1. Which observation does NOT indicate that a chemical reaction has occurred? a. formation of a precipitate c. evolution of heat and light b. production of a gas d. change in total mass of substances 2. In writing an equation that produces hydrogen gas, the correct representation of hydrogen gas is a. H. c. H2. b. 2H. d. OH. 3. To balance a chemical equation, it may be necessary to adjust the a. coefficients. c. formulas of the products. b. subscripts. d. number of products. 4. Which word equation represents the reaction that produces water from hydrogen and oxygen? a. Water is produced from hydrogen and oxygen. b. Hydrogen plus oxygen yields water. c. H2 + O2 water. d. Water can be separated into hydrogen and oxygen. 5. When the equation Fe3O4 + Al Al2O3 + Fe is correctly balanced, what is the coefficient of Fe? a. 3 c. 6 b. 4 d. 9 6. In what kind of reaction do two or more substances combine to form a new compound? a. decomposition reaction c. double-replacement reaction b. ionic reaction d. synthesis reaction 7. The equation AX A + X is the general equation for a a. synthesis reaction. c. combustion reaction. b. decomposition reaction. d. single-replacement reaction. 8. The equation AX + BY AY + BX is the general equation for a a. synthesis reaction. c. single-replacement reaction. b. decomposition reaction. d. double-replacement reaction. 9. In what kind of reaction does a single compound produce two or more simpler substances? a. decomposition reaction c. single-replacement reaction b. synthesis reaction d. ionic reaction 10. The reaction Mg(s) + 2HCl(aq) H2(g) + MgCl2(aq) is a a. composition reaction. c. single-replacement reaction. b. decomposition reaction. d. double-replacement reaction. 11. The reaction 2KClO3(s) 2KCl(s) + 3O2(g) is a(n) a. synthesis reaction. c. combustion reaction. b. decomposition reaction. d. ionic reaction. 12. Which branch of chemistry deals with the mass relationships of elements in compounds and the mass relationships among reactants and products in chemical reactions? a. qualitative analysis c. chemical kinetics b. entropy d. stoichiometry 13. The coefficients in a chemical equation represent the a. masses, in grams, of all reactants and products. b. relative numbers of moles of reactants and products. ____ 14. ____ 15. ____ 16. ____ 17. ____ 18. ____ 19. ____ 20. c. number of atoms in each compound in a reaction. d. number of valence electrons involved in the reaction. Each of the four types of reaction stoichiometry problems requires using a a. table of bond energies. c. Lewis structure. b. chart of electron configurations. d. mole ratio. In the reaction N2 + 3H2 2NH3, what is the mole ratio of nitrogen to ammonia? a. 1:1 c. 1:3 b. 1:2 d. 2:3 In the reaction 2H2 + O2 2H2O, what is the mole ratio of oxygen to water? a. 1:2 c. 8:1 b. 2:1 d. 1:4 In the reaction C + 2H2 CH4, what is the mole ratio of hydrogen to methane? a. 1:1 c. 1:2 b. 2:1 d. 2:4 The Haber process for producing ammonia commercially is represented by the equation N2(g) + 3H2(g) 2NH3(g). To completely convert 9.0 mol hydrogen gas to ammonia gas, how many moles of nitrogen gas are required? a. 1.0 mol c. 3.0 mol b. 2.0 mol d. 6.0 mol For the reaction C + 2H2 CH4, how many moles of hydrogen are required to produce 10 mol of methane, CH4? a. 2 mol c. 10 mol b. 4 mol d. 20 mol For the reaction AgNO3 + NaCl NaNO3 + AgCl, how many moles of silver chloride, AgCl, are produced from 7 mol of silver nitrate AgNO3? a. 1.0 mol c. 7.0 mol b. 2.3 mol d. 21 mol Element Bromine Calcium Carbon Chlorine Cobalt Symbol Br Ca C Cl Co Copper Fluorine Cu F Hydrogen H Iodine Iron Lead Magnesium Mercury Nitrogen I Fe Pb Mg Hg N Oxygen O Atomic mass 79.904 40.078 12.011 35.4527 58.933 20 63.546 18.998 4032 1.007 94 126.904 55.847 207.2 24.3050 200.59 14.006 74 15.9994 Potassium Sodium K Na Sulfur S 39.0983 22.989 768 32.066 ____ 21. For the reaction 2Na + 2H2O 2NaOH + H2, how many grams of sodium hydroxide are produced from 3.0 mol of water? a. 40. g c. 120 g b. 80. g d. 240 g ____ 22. For the reaction 2Na + Cl2 2NaCl, how many grams of chlorine gas are required to react completely with 2.00 mol of sodium? a. 35.5 g c. 141.8 g b. 70.9 g d. 212.7 g ____ 23. For the reaction CH4 + 2O2 CO2 + 2H2O, how many moles of carbon dioxide are produced from the combustion of 100. g of methane? a. 6.23 mol c. 12.5 mol b. 10.8 mol d. 25 mol ____ 24. For the reaction 2KlO3 2KCl + 3O2, how many moles of potassium chlorate are required to produce 250 g of oxygen? a. 2.0 mol c. 4.9 mol b. 4.3 mol d. 5.2 mol ____ 25. For the reaction 2Na + Cl2 2NaCl, how many grams of sodium chloride can be produced from 500. g each of sodium and chlorine? a. 112 g c. 409 g b. 319 g d. 825 g ____ 26. For the reaction SO3 + H2O H2SO4, how many grams of sulfuric acid can be produced from 200. g of sulfur trioxide and 100. g of water? a. 100. g c. 245 g b. 200. g d. 285 g ____ 27. For the reaction Cl2 + 2KBr 2KCl + Br2, calculate the percent yield if 200. g of chlorine react with excess potassium bromide to produce 410. g of bromine. a. 73.4% c. 91.0% b. 82.1% d. 98.9% ____ 28. For the reaction 2Na + 2H2O 2NaOH + H2, calculate the percent yield if 80. g of water react with excess sodium to produce 4.14 g of hydrogen. a. 87% c. 92% b. 89% d. 98% ____ 29. What is the measured amount of a product obtained from a chemical reaction? a. mole ratio c. theoretical yield b. percent yield d. actual yield ____ 30. A chemist interested in the efficiency of a chemical reaction would calculate the a. mole ratio. c. percent yield. b. energy released. d. rate of reaction. Short Answer 31. When a glass blower shapes molten glass into an ornament, does a chemical reaction occur? Explain. Problem Element Bromine Calcium Carbon Chlorine Cobalt Symbol Br Ca C Cl Co Copper Fluorine Cu F Hydrogen H Iodine Iron Lead Magnesium Mercury Nitrogen I Fe Pb Mg Hg N Oxygen Potassium Sodium O K Na Sulfur S Atomic mass 79.904 40.078 12.011 35.4527 58.933 20 63.546 18.998 4032 1.007 94 126.904 55.847 207.2 24.3050 200.59 14.006 74 15.9994 39.0983 22.989 768 32.066 32. What mass in grams of sodium hydroxide is produced if 20.0 g of sodium metal reacts with excess water according to the chemical equation 2Na(s) + 2H2O(l) 2NaOH(aq) + H2(g)? 33. What mass in grams of 1-chloropropane (C3H7Cl) is produced if 400. g of propane react with excess chlorine gas according to the equation C3H8 + Cl2 C3H7Cl + HCl? 34. What mass in grams of hydrogen gas is produced if 20.0 mol of Zn are added to excess hydrochloric acid according to the equation Zn(s) +2HCl(aq) ZnCl2(aq) + H2( )? 35. How many grams of ammonium sulfate can be produced if 30.0 mol of H2SO4 react with excess NH3 according to the equation 2NH3(aq) + H2SO4(aq) (NH4)2SO4(aq)? 36. How many moles of Ag can be produced if 350. g of Cu are reacted with excess AgNO3 according to the equation Cu(s) + 2AgNO3(aq) 2Ag(s) + Cu(NO3)2(aq)? Stoich chem reactions practice Answer Section MULTIPLE CHOICE 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21. 22. 23. 24. 25. 26. 27. 28. 29. 30. ANS: ANS: ANS: ANS: ANS: ANS: ANS: ANS: ANS: ANS: ANS: ANS: ANS: ANS: ANS: ANS: ANS: ANS: ANS: ANS: ANS: ANS: ANS: ANS: ANS: ANS: ANS: ANS: ANS: ANS: D C A B D D B D A C B D B D B A B C D C C B A D D C C C D C PTS: PTS: PTS: PTS: PTS: PTS: PTS: PTS: PTS: PTS: PTS: PTS: PTS: PTS: PTS: PTS: PTS: PTS: PTS: PTS: PTS: PTS: PTS: PTS: PTS: PTS: PTS: PTS: PTS: PTS: 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 SHORT ANSWER 31. ANS: A chemical reaction does not occur. Analysis of the molten glass and the glass in the ornament would reveal that both substances have the same chemical properties. PTS: 1 PROBLEM 32. ANS: 34.8 g NaOH PTS: 1 33. ANS: 712 g C3H7Cl PTS: 1 34. ANS: 40.4 g H2 PTS: 1 35. ANS: 3960 g (NH4)2SO4 PTS: 1 36. ANS: 11.0 mol Ag PTS: 1